Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

modules/rtp_rtcp/source/fec_test_helper.h

@@ -0,0 +1,134 @@
+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_
+#define WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_
+
+#include <memory>
+
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/rtp_rtcp/source/forward_error_correction.h"
+#include "webrtc/rtc_base/basictypes.h"
+#include "webrtc/rtc_base/random.h"
+
+namespace webrtc {
+namespace test {
+namespace fec {
+
+struct AugmentedPacket : public ForwardErrorCorrection::Packet {
+  WebRtcRTPHeader header;
+};
+
+// TODO(brandtr): Consider merging MediaPacketGenerator and
+// AugmentedPacketGenerator into a single class, since their functionality is
+// similar.
+
+// This class generates media packets corresponding to a single frame.
+class MediaPacketGenerator {
+ public:
+  MediaPacketGenerator(uint32_t min_packet_size,
+                       uint32_t max_packet_size,
+                       uint32_t ssrc,
+                       Random* random)
+      : min_packet_size_(min_packet_size),
+        max_packet_size_(max_packet_size),
+        ssrc_(ssrc),
+        random_(random) {}
+
+  // Construct the media packets, up to |num_media_packets| packets.
+  ForwardErrorCorrection::PacketList ConstructMediaPackets(
+      int num_media_packets,
+      uint16_t start_seq_num);
+  ForwardErrorCorrection::PacketList ConstructMediaPackets(
+      int num_media_packets);
+
+  uint16_t GetNextSeqNum();
+
+ private:
+  uint32_t min_packet_size_;
+  uint32_t max_packet_size_;
+  uint32_t ssrc_;
+  Random* random_;
+
+  ForwardErrorCorrection::PacketList media_packets_;
+  uint16_t next_seq_num_;
+};
+
+// This class generates media packets with a certain structure of the payload.
+class AugmentedPacketGenerator {
+ public:
+  explicit AugmentedPacketGenerator(uint32_t ssrc);
+
+  // Prepare for generating a new set of packets, corresponding to a frame.
+  void NewFrame(size_t num_packets);
+
+  // Increment and return the newly incremented sequence number.
+  uint16_t NextPacketSeqNum();
+
+  // Return the next packet in the current frame.
+  std::unique_ptr<AugmentedPacket> NextPacket(size_t offset, size_t length);
+
+ protected:
+  // Given |header|, writes the appropriate RTP header fields in |data|.
+  static void WriteRtpHeader(const RTPHeader& header, uint8_t* data);
+
+  // Number of packets left to generate, in the current frame.
+  size_t num_packets_;
+
+ private:
+  uint32_t ssrc_;
+  uint16_t seq_num_;
+  uint32_t timestamp_;
+};
+
+// This class generates media and FlexFEC packets for a single frame.
+class FlexfecPacketGenerator : public AugmentedPacketGenerator {
+ public:
+  FlexfecPacketGenerator(uint32_t media_ssrc, uint32_t flexfec_ssrc);
+
+  // Creates a new AugmentedPacket (with RTP headers) from a
+  // FlexFEC packet (without RTP headers).
+  std::unique_ptr<AugmentedPacket> BuildFlexfecPacket(
+      const ForwardErrorCorrection::Packet& packet);
+
+ private:
+  uint32_t flexfec_ssrc_;
+  uint16_t flexfec_seq_num_;
+  uint32_t flexfec_timestamp_;
+};
+
+// This class generates media and ULPFEC packets (both encapsulated in RED)
+// for a single frame.
+class UlpfecPacketGenerator : public AugmentedPacketGenerator {
+ public:
+  explicit UlpfecPacketGenerator(uint32_t ssrc);
+
+  // Creates a new AugmentedPacket with the RED header added to the packet.
+  static std::unique_ptr<AugmentedPacket> BuildMediaRedPacket(
+      const AugmentedPacket& packet);
+
+  // Creates a new AugmentedPacket with FEC payload and RED header. Does this by
+  // creating a new fake media AugmentedPacket, clears the marker bit and adds a
+  // RED header. Finally replaces the payload with the content of
+  // |packet->data|.
+  std::unique_ptr<AugmentedPacket> BuildUlpfecRedPacket(
+      const ForwardErrorCorrection::Packet& packet);
+
+ private:
+  static void SetRedHeader(uint8_t payload_type,
+                           size_t header_length,
+                           AugmentedPacket* red_packet);
+};
+
+}  // namespace fec
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_FEC_TEST_HELPER_H_